Piston



July 2O 1926.

' s. M. UDALE PISTON Filed NOV.

INVENTOR.,

Patented July 20, 1926.

UNITED STATES PATENT oFFlc.

STANLEY M. UDALE, OF DETROIT, MICHIGAN, ASSIGNOR TO EARL HOLLEY, OF DETROIT, MICHIGAN.

PISTON.

Application led November 15, 1924. Serial No. 750,066.

This invention relates to an improved piston. The object of this invention is to reduce both the cost of manufacture and the weight of ordinary gray iron pistons.

l The ditliculty heretofore experienced in n casting gray iron pistons has been that any attempt to lighten the weight of the piston has involved the use of loose piecesin the core box which prevented the production l of cheap pistons, as one of the principai items in the cost of a piston is the core.

In order that the core may be made cheaply, as for example by the means and methods. disclosed in theco-pending application of Alexander Anderson, Serial No.

694,918, filed Feb. 25, 1924, it is necessary that it should be formed in a two-part core box, the two halves of which should be drawn or separated on a plane at right angles to the axis of the wrist pin bosses. All light weight pistonsV which I am familiar with have been provided with various stiftening ribs or Webs which necessitated the use of loose pieces, which seriously interfered with economical production. This improved piston is free from this objection.

A further object of this invention is to arrange so that the mold in which the core is placed shall be free from all projections or'recesses. That is to say, that the wall of the mold shall be substantially smooth, the reason being that 'it is intended that these pistons shall be cast in the molds shown in the atent to Meloche, #1,502,861, and it has Iheen found that the life of the mold is greatly increased by avoiding any sharp corlnders or recesses on the surface of the mo l Figure l shows a cross sectional elevation on the plane 1 1 of Figure 3. 40

Figure 2 shows in elevation a side view of the piston.

Figure 3 shows a plan View of the piston. Figure 4 is a cross sectional plan view taken on the plane 4-4 of Figure 2. 45 In the figures, A is the piston head, B

is the upper portion of the piston skirt provided with the usual number of piston ring grooves. C D are the wrist pin bosses.

E F are two horizontal flanges connecting the bosses C and D and extending around the piston. G and H are the two side wallbearing strips. These strips are made in the form of the letter H.

I and J are recesses on the outside of the piston adjacent the bosses. K is the lower portion of the skirt connected to the bosses C and D by ribs L and M. 'Ihis lower portion of t-he skirt K is formed in the sha-pe of a channel so that it may be sufficiently stili UU to retain its shape. 1rert-ical ribs N O P Q extend from the bosses C D to the piston head A, providing the support for the piston head.

`What I claim is 65 A cutaway piston comprising a piston head, an upper skirt connected thereto, two piston pin bosses, webs extending from said bosses to said head, a lower skirt, bearing strips connected thereto and extending to the upper skirt, a horizontal circumferential rib extending from the bosses to the bearing strips.

In testimony whereof I affix my signature.

STANLEY M. UDALE. 

